Metal-testing apparatus



' G. B. COLLINS METAL TESTING APPARATUS Filed Oct. 5, 192a :s Shee ts-Sheet 1 Dec. 18, 1928.

G. B. COLLINS METAL TESTING APPARATUS Filed Oct. 5, 1923 5 Sheets-Sheet 2 a .8 E g =W m NM @Q w 6 wv vmg 5 0w Filed Oct. 5, 1923 G B COLLINS METAL TESTING APPARATUS Dec. 18, 1928.

Patented Dec. 18, 1928.

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enonenn. COLLINS, o1? ronT1eRTHnn,, zrnxAs; ,Assmnon; 'ME'SNE' ASSIGNMENTS, T THEMTEXAS,COMPANYQOFYNEW, YORK, N. Y,., e conroteziwiort or DELAWARE} METLIJ-TESTING' APPARATUS.

Ap iicatimmee October ,1923; Serial no. 666,669.

This invention relates-particularly to means fortesting sheet metal,- such asutin, copper, brass or the-like, or infect any sheet metal. The-inventionahas for one of its-principal 5- objects the provisioniof means:wherebyv different pieces of metal may be tested under identical conditions so that an accurate comparison bet'weeni the different pieces can; be easily and accuratelyimadee An important object of r the inventioni 1s testi is subjected? to'\ the 'saxme'stress: during each-successive cycle of operation and [WllGIBi by-ealelripiece of metaltestedflinathe device is I subjected to thesame stresses:

Still 1 further-obj Cl3S=. are to provide means for securing: the metalstrip to be 'tested 1n the machine, for: producingithe:propenmotion .of the movable member-s and for applying; the initial ibenddmthe stxrip under-test.

In the furtherance ofithe abov'eandiother objectssthe invention: contemplates' the 1 provision of means whereby: the metal: tobe tested may bG-"SUbjQOt-Bd' to axseries; of; stresses of'uniform degree of: intensity and embraces broadly and generally; mechanism comprising, opposed jaws: to .'Wh1Ch-" then metal to be tested '1 may beiseeured; :Inea-ns for, imparting a: predeterminedfosei'llating or! reciprocating motion to [the jWWS SO that tll'emetaihmaybealternately bentiand unbent; 'and' resilienta means tending: to oppose the: movement "of the=ja-ws;-;

In order that; my invention :may, be 1 clearly 5 understood, 1 will: now proceedi t0 1 describe the same in the following specificationand point" out the novel' features :thereof. in the appended-claims; Y e I Refeiringvto the drawings:

Figured is-a planiviem'ofra machin'eicom structed in accordance: \vithvmyi inventiom'. portions thereof" havlng been; out: awayi. to;

more clearly show; is construction;

Figure- 2 is another; plan 1 View; with 1 addi tional portions cut; away t Figure 3 is a central vertical:sectiontakenv on therline3 +3 of Figure 1:

Figures-4: and 5. are centred: verticalsec tions taken ion the'line3++3of Figure 1 sh0W-' 5o ing portions: of the: apparatus: and; different;

positions of thcmovable members Figflre'6 is; aiwnt ralaivertical esection ofithe wholeanachinei.

Figures 7 andi 8 a are; sections taken; on: the; agelinesfi i; and 8 8; respectively, DfYEl'QU re 1 a The apparatus thus illustrated:includes a base 10 hav1nga dove talled'i groove 11 in Which jaw members 12'and 13arcslidably 15 having a camway- 22 vvithinivvhichiprojects to provide means-l'whereby the metal. under member 12. Thusthea member 13". is pro vided onitsbottom Witha slot 16=into which a stopl'i', projectingupwardly from'tlie-base 10,- extends.-v It is-apparent that; the movement of? the member 13in either direction. is

limited by. the stop-17; A" spring or=resilientimember! 18 suitablyqpositionedzwithina :housing '19 is adapted to bear: againstithe slidable member; l3- tending: to push; it towards: the other, movablemember 1.2 and? againstythe stop 17., e The-resilient member--18 slioul'drbe carefully constructed and testedito deflect a given amount under, apredetermined'pressure.-' I111 the operation of; the device the -metal to lbetestediis bent when the member 12 is pushed? against: the member: 13,-.as; :will be hereinafter more fully-e explained, and the resilient'membenlS ser v'es=to opposethe movementaimparted towmember l3 byxmember l2 and :thusoperates :to 'llmlt the-amount oipressure-that; cam be exerted on the beutrmefnl:

The: calnw ay is so. :adjusted in ire-lation to the othertelements otthe device thatin-tlimOve ment imparted to themember '131by. the meta ber; 12 {the mei'nber- 1S' is never moved against the resiliencyo't'itl'iemember 18 to such ran-extent thati itvcomes in Contactv \vithith'e step 117.

Eachiof theslidable members'm and 13 is provided with f a clamp 23 pivotallyrmoi'lnted on apin2 1, and each ofthefslidable members is-also prfovi-dcd :With a recess 25' wherein the clamp 23 may be; positioned: for holdin a, stripbf this 26; oraother metal'ito ahe :teste each clamp 22% beingzcompo'sed of: a portion which is" .ad aptedi to thus enter" the 'iilicess 25 and an extending portion 27 which is adapted to rest upon the top of the slidable member. Each clamp is provided with a. handle 28. Each slidable member is provided with pins 29 by which the piece of tin 26 to be tested can be centered properly in the machine. Obviously, each sample of tin is cut of a given length and width that it just fits within the pins. It is understood, of course, that the sample or strip to be tested is cut or otherwise taken fromthe larger piece and is reduced to the size adopted standard for the particular machine. Another clamp member 30 is pivotally mounterhas on one of the pins 24 oneither of the slidable memhere 12 or 13. in the present instance, however, the clan'ip member 30 is shown mounted on the movable member 13. The clamp 30 is provided with a handle 31 and with a keen edged member or knife 32 of substantially V shaped cross section.

When it is desired to test a piece of metal the sample is placed on top of the slidable members 12 and 13, which are spaced slightly apart, and properly centered between the pins 29. The keen edged member 32 is then pressed downwardly into the space between the two slidable members 12 and 13 so that the tin is bent downwardly in substantially a V formation as shown in Figure 5. The clamp members 23 are then pressed into the recess 25 so as to firmly clamp the ends of the metal strip 26 in position. In common practice a mallet is used to hammer the clamps 23 into position. When the metal has been properly dented and firmly secured the handle let is moved backward and forward thereby causing the slidable member 12 to move back and forth by reason of the cam action already described. By this n'iovement the metal 26 under the knife 32 is alternately bent and straightened. 'llhe movement is continued until the metal breaks. The nu.- merical expression of the test is given by the number of movements of the handle 14.

It will be observed that in the bending of the metal under test the pushing of the member 12 against the member 13 places the spring 18 under a predetern'iined tensionwhich insures that a given pressure will be exerted on the bent metal. Thus regardless 10f ditiercnces in the speed or character of the movement imparted to the lever 14; the same degree of stress-is given to the metal each time it is bent. By thus combining the cam controlled movement with the resilient means for opposing the ll'lOVQll'lGl'lt during the bending of the metal the oscillations of the handle ll are thus caused to subject the a metal to the same stress with each stroke so that uniform results are obtained.

Apparatus of preferred form and construction has been illustrated and described for the purpose of showing a way in which this invention may be constructed, but the inventive thought upon which this application is based is broader than this illustrative embodiment thereof. lit is, therefore, understood that the scope of the invention is not to be limited by the present disclosure, referones being had to the appended claims for that purpose.

What I claim is: V 1

1. Apparatus for testing sheet metals comprising a base, a plurality of members slidably mounted on the base, means for securing the metal to be tested to the slidable memhere, means comprising akeen edgedniember pivotally mounted on one of said slidable members for applying an initial bend in the strip under test, and means operativcly connected to the other slidable member whereby the strip is alternately bent and straight ened until broken.

2. Apparatus for testing strip metal comprising a base, a pair of oppositely disposed jaw members slidably mountedon the base, means for securing an end of the metal strip to be tested to each of the slidable aw mem bers, resilient means cooperating with one of the slidable jaw members, and means producing a cam action cooperating with the other slidable jaw member for moving the member backward and forward a predetermined distance on the base. i

3. Apparatus for testing strip metal, comprising a base having a dovetailed groove extending longitudinally thereof, a pair of oppositely disposed members slidably mounted in said groove, means for positively limiting the longitudinal movement of one of said members, resilient means exerting a constant longitudinal force against that member, means operatively connected to the base and to the other slidable member for moving the latter back and forth a predetermined distance on the base, and means pivotally mounted on each of the slidable members for securing thereto an end of the strip to be tested.

4. Apparatus for testing strip metals comprising a base, a pair of opposed jaw members slidably mounted on said base, spaced projections on each of said jaw members for initially centering the metal strip under test thereon, means for subsequent-1y clamping adapted to receive the projection on the face of the movable member, and means for oscillatmg the cam to provide a reciprocating movement of the jaw member with which it is connected.

6. Apparatus for testing strip metal comprising a base, slidable members mounted on the base, means for securing an'end of the metal to be tested to each of the slidable members, means on one of the slidable members for applying an initial bend in the strip under test, and means operatively connected to one of the slidable members for moving it backward and forward whereby the'strip is alternately bent and straightened until broken.

movement of said member. I

7. Apparatus for testing strip metal comprising a base having a groove extending longitudinally thereof, oppositely disposed jaw members slidably mounted in said groove, means for securing an end of the metal strip to be tested to each of the slidable jaw members, and an eccentric cooperating with one of the slidablejaw members for effecting a limited and re ular reciprocating In witness whereof, I have hereunto set my hand this 28 day of Sept, 1923.

GEO. B. COLLINS. 

